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A new drug for migraine headaches has been introduced on the market. You would like to know if migraine patients prefer the old drug or the new drug. So, you sample 190 patients that have used both drugs and you find that 52% of the sampled patients prefer the new drug, 48% of the patients prefer the old drug. Find the 90% confidence limit for the proportion of all patients that prefer the new drug. Can you be 90% confident that a majority of patients prefer the new drug?
describe a fictional two-group experiment that could be tested with an independent t-test but violates the assumption
You are investigating an arson scene and you find a corpse in the rubble, but you suspect that the victim did not die as a result of the fire.
according to a hospital administrator historical records over the past 10 years have shown that 20 percent of the major
Customer satisfaction A department store mails a customer satisfaction survey to people who make credit card purchases at the store.
a) Use the method of moments to estimate the two parameters of the beta distribution. b) Use a quantile-quantile plot to assess the goodness of fit.
the u.s. post office is interested in estimating the mean weight of packages shipped using the overnight service. they
consider the experiment of drawing two cards from a shuffled deck and then getting them back where success is now
A researcher wants to determine whether or not a five-week crash diet is effective over a long period of time.
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
Determine the probability the sample of 40 will have a sales average less than $400,000.
If the ball is red put it back into the urn. If the ball is black, replace it with a red ball. Let X be the number of picks needed to get the fourth black ball. Find E[X].
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportions of children are overweight?
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